(57) A rectifier device (2) for a three phase AC generator (1) of an automobile is disclosed,
in which the rectifier diodes (201, 202, 203) are of the high speed switching type
having a reverse recovery time of not more than 2 seconds. Thus, the commutation surges,
which adversely affects the performance of the equipment supplied by the output of
the rectifier device (2), are suppressed. The generator (1) may have armature coils
(101) in Y-connection and the rectifier device may comprise, in addition to the full-wave
rectifier circuit (2) which rectifies the line output voltages of the armature coils
in Y-connection, a series circuit of a pair of diodes (201d, 203d) which is coupled
across the ouput terminals of the above mentioned full-wave rectifier circuit (2),
wherein the neutral point of the Y-connected armature coils is coupled to an intermediate
point between the pair of diodes. In such case, only the diodes of the series circuit,
or alternatively, only the diodes of the full-wave rectifier circuit, may be of the
high speed switching type. The rectifier device (2) may further comprise auxiliary
diodes for outputting a voltage to a voltage regulator, which diodes are not high
speed switching type.
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